SystObjectUnioniserAlg.h

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
 
  SystObjectUnioniserAlg:
  This alg takes a set of systematic variation containers which have
  been filtered, then using the links set by SystObjectLinkerAlg
  constructs new containers holding the objects that are in any
  of the filtered variation containers.
 
  This is templated to support recording the union containers as
  the concrete type, not least because xAOD::IParticleContainer has
  no CollectionProxy to support writing with AsgxAODNTupleMakerAlg.
 
*/

 
 
// Always protect against multiple includes!
#ifndef CP_SYSTUNIONISERALG
#define CP_SYSTUNIONISERALG
 
 
 
#include <AnaAlgorithm/AnaReentrantAlgorithm.h>
#include "PATInterfaces/SystematicSet.h"
#include <SystematicsHandles/SysReadHandle.h>
#include <SystematicsHandles/SysWriteHandle.h>
#include <SystematicsHandles/SysListHandle.h>
#include <SystematicsHandles/ISysHandleBase.h>
#ifdef XAOD_STANDALONE
#include <AsgTools/PropertyWrapper.h>
#endif
 
#include <AthContainers/DataVector.h>
#include <AthContainers/ConstDataVector.h>
#include <xAODBase/IParticleContainer.h>
#include <xAODJet/Jet.h>
#include <xAODJet/JetContainer.h>
#include <xAODEgamma/Electron.h>
#include <xAODEgamma/ElectronContainer.h>
#include <xAODEgamma/Photon.h>
#include <xAODEgamma/PhotonContainer.h>
#include <xAODMuon/Muon.h>
#include <xAODMuon/MuonContainer.h>
#include <xAODTau/TauJet.h>
#include <xAODTau/TauJetContainer.h>
#include <xAODTau/DiTauJet.h>
#include <xAODTau/DiTauJetContainer.h>
 
#include <vector>
#include <unordered_map>
#include <utility>
#include <memory>
 
class EventContext;
 
namespace CP
{
  typedef ElementLink<xAOD::IParticleContainer> iplink_t;
 
  // We need separate template parameters for the object type
  // and container, as DataVector<xAOD::Blah_v1> does not have
  // a classID, where BlahContainer does.
  template<class T, class C>
  class SystObjectUnioniserAlg : public EL::AnaReentrantAlgorithm
  {
public:
    using EL::AnaReentrantAlgorithm::AnaReentrantAlgorithm;

    StatusCode initialize() override;
    StatusCode execute(const EventContext& ctx) const override;
 
private:
 
    // Members for configurable properties

    CP::SysListHandle m_systematicsList {this};

    CP::SysReadHandle<C>
      m_inputHandle{ this, "input", "",   "Container to read" };

    CP::SysWriteHandle<ConstDataVector<C> >
      m_outputHandle{this, "output", "",  "Collection holding all objects passing any systematic"};

    Gaudi::Property<std::string> m_syst_decor_pattern
      { this, "systVarLink_template", "systVarLink_%SYS%", "Pattern to be substituted with systematics names"};

    std::unordered_map<size_t,SG::ConstAccessor<iplink_t> >
      m_syst_link_acc;
  };
 
  // The following classes are instantiated concretely for source code
  // configuration in Root/SystObjectUnioniserAlg.cxx.
  extern template class SystObjectUnioniserAlg<xAOD::Jet,xAOD::JetContainer>;
  extern template class SystObjectUnioniserAlg<xAOD::Electron,xAOD::ElectronContainer>;
  extern template class SystObjectUnioniserAlg<xAOD::Photon,xAOD::PhotonContainer>;
  extern template class SystObjectUnioniserAlg<xAOD::Muon,xAOD::MuonContainer>;
  extern template class SystObjectUnioniserAlg<xAOD::TauJet,xAOD::TauJetContainer>;
  extern template class SystObjectUnioniserAlg<xAOD::DiTauJet,xAOD::DiTauJetContainer>;
 
  // Trivial subclassing for more convenient python configuration
  // Otherwise genConf creates a horribly mangled templated name
  // even if typedef'ed
  class SystJetUnioniserAlg final : public SystObjectUnioniserAlg<xAOD::Jet,xAOD::JetContainer>
  {
  public:
    SystJetUnioniserAlg(const std::string &name,ISvcLocator *pSvcLocator)
      : SystObjectUnioniserAlg<xAOD::Jet,xAOD::JetContainer>(name, pSvcLocator) {};
  };
 
  class SystElectronUnioniserAlg final : public SystObjectUnioniserAlg<xAOD::Electron,xAOD::ElectronContainer>
  {
  public:
    SystElectronUnioniserAlg(const std::string &name,ISvcLocator *pSvcLocator)
      : SystObjectUnioniserAlg<xAOD::Electron,xAOD::ElectronContainer>(name, pSvcLocator) {};
  };
 
  class SystPhotonUnioniserAlg final : public SystObjectUnioniserAlg<xAOD::Photon,xAOD::PhotonContainer>
  {
  public:
    SystPhotonUnioniserAlg(const std::string &name,ISvcLocator *pSvcLocator)
      : SystObjectUnioniserAlg<xAOD::Photon,xAOD::PhotonContainer>(name, pSvcLocator) {};
  };
 
  class SystMuonUnioniserAlg final : public SystObjectUnioniserAlg<xAOD::Muon,xAOD::MuonContainer>
  {
  public:
    SystMuonUnioniserAlg(const std::string &name,ISvcLocator *pSvcLocator)
      : SystObjectUnioniserAlg<xAOD::Muon,xAOD::MuonContainer>(name, pSvcLocator) {};
  };
 
  class SystTauUnioniserAlg final : public SystObjectUnioniserAlg<xAOD::TauJet,xAOD::TauJetContainer>
  {
  public:
    SystTauUnioniserAlg(const std::string &name,ISvcLocator *pSvcLocator)
      : SystObjectUnioniserAlg<xAOD::TauJet,xAOD::TauJetContainer>(name, pSvcLocator) {};
  };
 
  class SystDiTauUnioniserAlg final : public SystObjectUnioniserAlg<xAOD::DiTauJet,xAOD::DiTauJetContainer>
  {
  public:
    SystDiTauUnioniserAlg(const std::string &name,ISvcLocator *pSvcLocator)
      : SystObjectUnioniserAlg<xAOD::DiTauJet,xAOD::DiTauJetContainer>(name, pSvcLocator) {};
  };
 
}
 
#include "AsgAnalysisAlgorithms/SystObjectUnioniserAlg.icc"
 
#endif